net: drop write-only stack variable

Remove a write-only stack variable from unix_attach_fds(). This is a
left-over from the security fix in:

    commit 712f4aad406bb1ed67f3f98d04c044191f0ff593
    Author: willy tarreau <w@1wt.eu>
    Date:   Sun Jan 10 07:54:56 2016 +0100

        unix: properly account for FDs passed over unix sockets

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 4 deletions

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 49d5093eb055..b3745557fc89 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -1534,7 +1534,6 @@ static int unix_attach_fds(struct scm_cookie *scm, struct sk_buff *skb)
 {
         int i;
         unsigned char max_level = 0;
-        int unix_sock_count = 0;
 
         if (too_many_unix_fds(current))
                 return -ETOOMANYREFS;
@@ -1542,11 +1541,9 @@ static int unix_attach_fds(struct scm_cookie *scm, struct sk_buff *skb)
         for (i = scm->fp->count - 1; i >= 0; i--) {
                 struct sock *sk = unix_get_socket(scm->fp->fp[i]);
 
-                if (sk) {
-                        unix_sock_count++;
+                if (sk)
                         max_level = max(max_level,
                                         unix_sk(sk)->recursion_level);
-                }
         }
         if (unlikely(max_level > MAX_RECURSION_LEVEL))
                 return -ETOOMANYREFS;